Antony Costa has announced his engagement to girlfriend Rosanna Jasmin, after whisking her off to Paris for a romantic birthday surprise.

"We're Engaged!!!!!!!!!" tweeted the bride-to-be, along with a picture of the couple under the Eiffel Tower where she flashed her engagement ring.

Antony also took to Twitter to thank fans for congratulatory messages. "Thank you for your lovely messages," he tweeted. "Myself and @RosannaJasmin are so happy to announce our engagement!!! Bring on 2014 xxx."

The news caps off brilliant year for Blue, which included appearing in ITV's Big Reunion Tour.

"What a way to end a magical year for Blue," they tweeted on their official page. "Congratulations @AntonyCosta & @RosannaJasmin on their engagement today."